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Income Taxes - Tax effects of significant temporary differences of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Deferred tax assets:        
Employee related accruals $ 5,703 $ 5,735    
Inventory 726 4,766    
Environmental remediation 974 1,128    
Net operating loss carry forwards-domestic 1,618 902    
Net operating loss carry forwards-foreign 5,221 3,703    
Operating lease liabilities 5,732      
Other 6,340 6,302    
Deferred tax assets, gross 26,314 22,536    
Valuation allowance (3,403) (808) $ (861) $ (438)
Deferred tax assets, net of valuation allowance 22,911 21,728    
Deferred tax liabilities:        
Property, plant and equipment and intangible assets (6,108) (6,071)    
Operating lease ROU assets (5,657)      
Other (921) (772)    
Deferred tax liabilities, net (12,686) (6,843)    
Net deferred tax asset $ 10,225 $ 14,885